CN209945737U - Simulation test system for major-diameter earth pressure shield tunneling interface - Google Patents
Simulation test system for major-diameter earth pressure shield tunneling interface Download PDFInfo
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- CN209945737U CN209945737U CN201920793855.2U CN201920793855U CN209945737U CN 209945737 U CN209945737 U CN 209945737U CN 201920793855 U CN201920793855 U CN 201920793855U CN 209945737 U CN209945737 U CN 209945737U
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Abstract
The utility model discloses a major diameter earth pressure shield tunnel tunnelling interface analogue test system. Filling a soil sample in a model box for placing a shield model, wherein the shield tunneling system comprises a soil bin control device and a soil discharging and water discharging control device and is used for simulating a shield tunneling process; the water level control system sends water to the model boxes at different heights to realize underground water level simulation; the seepage tracing device traces the seepage streamline distribution at the position by the diffusion of the pigment under the seepage action; the monitoring system comprises a digital photographic camera and soil and water pressure sensors and is used for monitoring the deformation of a soil body of the driving face, the pressure distribution of the soil bin and the fluctuation rule. The utility model discloses a set up different water level height, tunnelling speed, monitoring soil body is out of shape, soil storehouse pressure fluctuation and seepage flow distribution for the groundwater seepage law and the unstability characteristic of major diameter shield driving face in the research infiltration stratum make effectual early warning to driving face unstability, and then establish and correspond the unstability mechanism.
Description
Technical Field
The utility model relates to a tunnel driving interface analogue test system, in particular to major diameter earth pressure shield constructs tunnel driving face analogue test system.
Background
At present, the construction of an earth pressure shield is developing towards the direction of large diameter and large burial depth. In the actual tunneling process, the pressure of the soil bin constantly fluctuates along with the influence of factors such as cutter rotation, excavation, shield propulsion, lubricating foaming agent injection and the like. Along with the increase of the diameter of the earth pressure shield, the pressure difference at different heights in the earth bin is more obvious, the middle upper part of the earth bin is easy to form an obvious low-pressure area under tunneling disturbance, the supporting load of a local area is insufficient, and the strain localization characteristic appears in the partial area first. The earth pressure shield in the permeable stratum is frequently unstable in the tunneling surface and stratum collapse accidents, strain is locally accelerated under the seepage action, a through shear zone is gradually formed, and unstable soil body slides along the shear zone to form collapse damage.
With the progress of the test technology, the model test can be applied to the research of the stability problem of the shield driving face because the model test can truly reflect the instability movement process of the soil body. Before the utility model is made, the Chinese invention patent with the publication number of CN105019920A relates to a stratum deformation test system of a shallow buried underground excavation tunnel, and aims to provide a stratum deformation test system under advanced reinforcement of the shallow buried underground excavation tunnel; stress release under a footage of shallow-buried underground excavation is simulated through retreating of a movable panel, and the ground surface settlement rule and the stress release rule of an excavation surface are researched through different combination advanced reinforcement settings of ground surface settlement monitoring, axial force change, retreating speed and grouting pipe sheds. The model test is developed under the condition of dry sand, the surface settlement deformation and the excavation face axial force change rule under different advanced reinforcement forms are mainly measured, the influence of seepage effect on the stability of the excavation face is not involved, the simulation of the excavation process in the model is realized by adopting the backward movement of a panel, the difference from the actual shield excavation behavior is larger, and the characteristic of pressure fluctuation in the large-diameter shield excavation construction soil bin cannot be reflected.
The method has important significance for further researching the instability development process of the shield driving face of the medium-diameter and large-diameter shield driving face under the action of groundwater seepage, revealing instability damage stage characteristics and realizing the simulation of large-diameter shield driving behaviors in a permeable stratum.
Disclosure of Invention
The utility model discloses not enough to prior art exists, provide one kind and can realize that major diameter shield constructs the simulation of driving face unstability development process under the seepage flow effect and survey, for analysis driving face stable state, reveal under the seepage flow effect major diameter shield and construct driving face unstability development process and stage characteristic and provide the model test device of the simulation major diameter earth pressure shield tunnel driving interface behavior of experiment foundation.
The technical scheme for realizing the aim of the utility model is to provide a large-diameter earth pressure shield tunnel driving interface simulation test system, which comprises a model box, a shield model, a monitoring system, a shield driving system, a water level control device and a seepage tracing device;
the model box is a rectangular cube, the peripheral panels are made of transparent high-strength organic materials, a semicircular opening for installing a shield model and an opening for installing a shield tunneling system are respectively formed in one side panel of the model box, and a plurality of openings with different heights for installing water supply pipes of a water level control system are formed in the other opposite side panel of the model box; filling a soil sample in the model box;
the shield tunneling system comprises a soil bin control device and a soil discharging and water discharging control device; the soil bin control device comprises a soil bin partition plate, a shaft force meter, a transmission rod, a recording device, a transmission, a driving device and an external support; the soil bin partition plate is a semicircular panel and is arranged between the inner concave surface of the semicircular shield model shell and the front panel of the model box, and a muck outlet is formed in the lower part of the soil bin partition plate; the soil bin partition plate, the axial force meter and the transmission rod are sequentially connected, the transmission rod penetrates through one side panel of the model box and is connected to a speed changer outside the model box, the speed changer is connected with a driving device, and the driving device is fixed on an external support; one end of the recording device is fixed on the external support, and the other end of the recording device is connected to the soil bin partition plate; the soil bin partition plate moves in the semicircular shield shell under the control of the transmission rod; the axial force meter is used for testing the pressure of the movable panel, and the recording device is used for testing the moving distance of the movable panel; the driving device provides power for the movement of the movable panel, and the transmission is used for controlling the forward and backward speeds of the movable panel; the soil discharging and water discharging control device comprises a conveyor, a power device, a water discharging pipeline, a valve, a flowmeter and a waste water tank, wherein the conveyor is arranged at a residue soil outlet at the lower part of the soil bin partition plate, the conveyor penetrates through one side panel of the model box and is connected to the power device, and the power device is fixed on an external support; an opening below the conveyor is connected with a drain pipe, a water outlet valve and a flowmeter are arranged on the drain pipe, and the drain pipe is connected with a wastewater tank;
the water level control system comprises a pressure pump, a water replenishing tank, a water supply pipe and a valve; the water supply tank and the pressure pump are connected through a water supply pipe; a plurality of water supply pipes which are longitudinally arranged penetrate through an opening on one side panel of the model box and are inserted into the filling soil samples at different heights in the model box, and the outlets of the water supply pipes are sealed by filter membranes; a valve is arranged on the water supply pipe, the water level in the model box is controlled, the water supply pipe opening valves at different heights are selected, and the soil sample filled in the model box is filled with water, so that the soil sample at the upper part of the water level is in an unsaturated state, and the underground water level simulation is realized;
the seepage tracing device is arranged at the top of the model box and comprises a pigment pipe and a pigment supply tank, and the pigment pipes are inserted into a shallow soil layer filled with soil samples in the model box from the top of the model box along the axial direction and are arranged at a position close to a front panel in the model box; the pigment pipe is provided with a valve for controlling the supplement of the pigment;
the monitoring system comprises a digital photographic camera and soil and water pressure sensors; the digital photographic camera is arranged outside the front panel of the model box and used for recording the change condition of the soil sample in front of the tunneling surface in the test process; the soil and water pressure sensors are arranged on the soil bin partition plate and used for observing the pressure distribution and fluctuation rule of the driving surface.
The inner space before the soil bin partition plate of the shield model is filled with improved muck, and the improvement of the excavation soil body is divided in the soil bin of the large-scale soil pressure shield machine in simulation.
The driving device and the power device adopt servo motors.
The recording device adopts a linear displacement sensor.
The conveyer adopts a tubular screw conveyer, and the screw speed is controlled by a power device to realize quantitative soil discharging and water discharging control; and sealing clay is filled in the pipe of the tubular screw conveyor in advance. The lower part of the conveyor, which is close to the residue soil outlet, is provided with an opening, the opening is sealed by a filter membrane, and the opening is connected with a drain pipe.
The utility model discloses set up supplementary light source in the outside of mold box front panel.
By using the simulation test system for the major-diameter earth pressure shield tunneling interface provided by the embodiment, different test conditions can be set for carrying out the following comparison tests:
under the condition that the height of the underground water level and the soil discharge speed of the conveyor are unchanged, different soil bin partition plate propelling speeds are set, and the influence of the tunneling speed on the instability condition of a tunneling surface is researched; under the condition that the height of the underground water level and the propelling speed of the soil bin partition plate are unchanged, different soil discharging speeds of the conveyor are set, and the influence of the soil discharging speeds on the instability condition of the tunneling surface is researched.
Different underground water levels are set, the seepage effect is more obvious when the underground water level is higher, the influence of the seepage effect on the stability of the tunneling surface is analyzed, and the seepage-induced instability mechanism of the tunneling surface is disclosed.
And (3) filling or not filling different improved mucks prepared in an indoor test in the shield model, and comparing and analyzing the inhibition effect of the different improved mucks on the seepage effect.
The utility model can be operated according to the following steps when in operation
A simulation test system is installed before a test, and when no soil sample exists in the box, the moving speed of the soil bin partition plate and the reading of an axial force meter generated by friction of the panel and the semi-circular shield shell at different speeds are calibrated. Then the soil bin partition plate is moved to a position 1/3 away from the front end of the semicircular shield shell, the inner space in front of the partition plate of the shield model is filled with improved muck, and the improvement of the excavated soil body in the soil bin of the large soil pressure shield machine is simulated.
And then filling a soil sample in the model box by adopting a rain falling method, arranging a pigment pipe along the front panel of the model box, and burying an outlet in a shallow soil layer. The shield tunneling simulation is realized through the advancing speed of the soil bin partition plate, the soil discharging speed of the conveyor is controlled to correspond to the advancing speed of the soil bin partition plate, the soil discharging amount is equal to the volume reduction of the soil bin, and different underground water level heights and the advancing speed of the soil bin partition plate are set to simulate different excavation processes. The pressure distribution and fluctuation rules of the soil bin are observed through soil and water pressure sensors in front of the soil bin partition plate, the seepage tracing device displays the seepage rules of underground water, a displacement field and a speed field of a soil body of a symmetrical surface can be obtained through PIV analysis of a camera recording picture, and the stress release of an excavation surface can be analyzed through the reading change of an axial force meter.
The principle of the utility model is that: the cross section of the shield machine is circular, and the instability development process of the major diameter shield tunneling surface under the seepage action is analyzed by using axial symmetry by adopting a semicircular shield model. The shield tunneling system adopts the advancing of a soil bin partition plate and the soil discharging of a conveyor to simulate the forward tunneling and soil discharging behaviors of the large soil pressure shield tunneling machine, is close to the actual shield tunneling behavior, simultaneously fills prepared improved muck in a shield model in front of the soil bin partition plate, simulates the process of injecting an additive into the soil bin of the actual large soil pressure shield tunneling machine and stirring a soil sample to enable the soil sample to reach a better flow plastic state. The higher the underground water level is, the more obvious seepage effect is, so that in order to analyze the influence of the seepage effect on the stability of the tunneling surface and reveal the mechanism of inducing the instability of the tunneling surface by the seepage, different underground water level heights need to be set for the model. The water level control device injects water into the model box through the water outlets arranged at different heights, and different water level heights are arranged, so that the soil sample at the lower part of the water level is in a saturated state, and the soil sample at the upper part of the water level is in an unsaturated state, thereby simulating the soil sample state under the condition of real underground water level. The seepage tracing device is characterized in that a row of pigment pipes are erected in the shallow soil sample along the axis direction, pigments with different colors are supplemented into the pipes, and the pigments can be diffused under the seepage effect to trace the streamline at the position to obtain the seepage field distribution rule of the tunneling surface. The monitoring system is divided into two parts, namely, an external digital photographic camera is arranged on a front panel of the model box, the change condition of a soil sample in front of a tunneling surface in the test process is recorded, and an observation image is processed through a particle digital measurement system (PIV); and secondly, arranging soil and water pressure sensors in front of the soil field partition plate to measure the soil and water pressure distribution condition and the fluctuation rule of the excavation face. Therefore, the stable state of the heading face is analyzed, and the instability development process and stage characteristics of the major-diameter shield heading face under the seepage action are revealed.
Compared with the prior art, the utility model has the advantages that the utility model provides a key function of major diameter earth pressure shield tunnel tunnelling interface analogue test system is the simulation observation that realizes major diameter shield tunnelling face unstability development process under the seepage flow effect, makes effectual early warning to the tunnelling face unstability, and then establishes corresponding unstability mechanism. The shield tunneling process is simulated by adopting the propelling soil bin partition plate and the residue soil transmission, and the shield tunneling process is closer to the actual shield tunneling behavior. By preparing different improved muck and filling the improved muck in the shield model, the influence of the properties of the improved muck on the instability condition of the tunneling surface can be analyzed.
Drawings
Fig. 1 is a schematic view of a front-view cross-sectional structure of a large-diameter earth pressure shield tunneling interface simulation test system provided by an embodiment of the present invention;
fig. 2 is a schematic side view of a cross-sectional structure of a simulation test system according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a side view cross-sectional structure of a shield model in a simulation test system;
FIG. 4 is a schematic structural diagram of a shield tunneling system in a simulation test system;
FIG. 5 is a detailed view of a portion of a device for controlling the removal and drainage of soil in a simulation test system;
fig. 6 is a schematic structural diagram of a water level control device and a seepage tracing device in a simulation test system provided by an embodiment of the present invention;
in the figure, 1. model box; 2. a shield model; 3. a shield tunneling system; 4. a water level control device; 5. a seepage tracing device; 6. a monitoring system; 7. soil sampling; 8. a digital photographic camera; 9. a supplemental light source; 10. soil and water pressure sensors; 11. a mold box front panel; 12. a semi-circular shield shell; 13. a shield support; 14. a soil bin partition; 15. an axial force meter; 16. a transmission rod; 17. a linear displacement sensor; 18. a transmission; 19. a servo motor A; 20. a rubber seal strip; 21. a residue soil outlet; 22. a conveyor; 23. a servo motor B; 24. a drain pipe; 25. a valve; 26. a flow meter; 27. a wastewater tank; 28. sealing the daub; 29. a pressure pump; 30. a water supply tank; 31. a water supply pipe; 32. a pigment replenishment tank; 33. a pigment tube; 34. improving the residue soil.
Detailed Description
The technical solution of the present invention will be described in further detail with reference to the accompanying drawings and the detailed description.
Example 1
The embodiment provides a simulation test system for a tunneling interface of a large-diameter earth pressure shield tunnel, which simulates different tunneling speeds by setting different water level heights and monitors a seepage process, pressure fluctuation of an earth bin, soil deformation and axial force of a tunneling surface, so that the underground water seepage rule and instability characteristics of the tunneling surface of the large-diameter earth pressure shield in a permeable stratum are researched.
Referring to fig. 1 and 2, the simulation test system provided in this embodiment includes a model box 1, a shield model 2, a shield tunneling system 3, a water level control device 4, a seepage tracing device 5, and a monitoring system 6. The model box is a rectangular box with an opening at the upper part, so as to fill the soil sample 7 and place the shield model 2; the surrounding panels of the model box 1 are all transparent toughened glass plates, so that the deformation condition of the soil layer can be conveniently monitored and recorded by the outside, and the bottom panel of the model box 1 is a steel plate. The left and right side panels are provided with openings, the upper opening of the left side panel is a semicircular opening with the diameter of 550mm, and the different height parts of the right side panel are provided with openings.
The monitoring system 6 comprises a digital photographic camera 8, a supplementary light source 9 and a soil and water pressure sensor 10; the digital photographic camera 8 and the supplementary light source 9 are arranged outside the front panel 11 of the model box and used for recording the change condition of the soil sample in front of the tunneling surface in the test process, and the picture can be analyzed and processed by PIV; the soil and water pressure sensor 10 is arranged on the soil bin partition plate and used for observing the pressure distribution and fluctuation rule of the driving surface.
The shield model 2 is a semi-circular cylindrical model and comprises a semi-circular shield shell and an inner arc solid shield support, and a semi-circular outer convex surface of the semi-circular shield shell can be matched and fixed with an inner arc surface of the shield support; the semi-circular shield shell is fixed with a front panel, a bottom panel and a left panel of the model box by utilizing a shield support, and the left side of the semi-circular shield shell is aligned with an opening of a side panel of the model box; the bottom surface of the shield support is fixed on a bottom panel of the model box, and a semi-circular inner concave surface of the semi-circular shield shell is ensured to face a front panel of the model box;
referring to the attached figure 3, the shield model is a semi-circular cylindrical model and comprises a semi-circular shield shell 12 and a shield support 13, and the shield model is used for analyzing the underground water seepage rule and instability characteristics of a tunneling surface caused by circular cylindrical shield tunneling by using axial symmetry. Semicircular shield shell 12 adopts the alloy steel of aluminizing to make, and internal diameter 600mm, shield support 13 are for adopting the interior arc entity support that high strength alloy steel plate made, and the annular outer convex surface of semicircle of semicircular shield shell 12 can match fixedly with the interior cambered surface of shield support 13. The semi-circular shield casing 12 is installed in the mold box by the shield support 13, specifically: the semi-circular shield casing 12 is fixed with a front panel, a bottom panel and a left panel of the model box by utilizing the shield support 13, the left side of the semi-circular shield casing 12 is aligned with the opening center of the left panel of the model box, the bottom surface of the shield support 13 is fixed on the bottom panel of the model box, and the semi-circular annular concave surface of the semi-circular shield casing 12 is ensured to face the front panel of the model box. The edge of the soil bin partition plate 14 is adhered with a rubber sealing strip 20, and the semicircular shield shell 12 is slightly wiped to prevent soil samples from entering the shield; a residue soil outlet 21 with the diameter of 60mm is arranged at the lower part of the soil bin partition plate 14 and is connected with a soil discharging and water discharging control device to realize the shield tunneling soil discharging and seepage control; the soil and water pressure sensor 10 is arranged on a soil bin partition 14 and is used for observing the pressure distribution and fluctuation rule of the driving surface.
Referring to fig. 4 and 5, a schematic structural diagram of a shield tunneling system and a partial detailed diagram of a soil discharge and water discharge control device in the simulation test system provided in this embodiment are respectively shown.
The shield tunneling system comprises a soil bin control device and a soil discharging and water discharging control device. The soil bin control device comprises a soil bin partition plate 14, an axial force meter 15, a transmission rod 16, a linear displacement sensor 17, a transmission 18, a servo motor A19 and an external support.
The soil bin partition plate 14 is a semicircular panel, the inner diameter of the semicircular annular concave surface with the radius slightly smaller than the semicircular annular shield shell is integrally arranged between the semicircular annular shield shell concave surface and the front panel of the model box, and the thickness is 40 mm. The improved muck 34 is filled in the front inner space of the soil bin partition plate 14 of the shield model, and the improvement of the dug soil body in the soil bin of the large soil pressure shield machine is simulated; the soil and water pressure sensor 10 is arranged on a soil bin partition 14 and is used for observing the pressure distribution and fluctuation rule of the driving surface.
The soil bin partition plate 14, the shaft force meter 15 and the transmission rod 16 are sequentially connected, the transmission rod 16 penetrates through an opening of a left panel of the model box and is connected to a transmission 18 outside the model box, the transmission 18 is connected with a servo motor A19, and the servo motor A19 is fixed on an external support. One end of the linear displacement sensor 17 is fixed on the external support, and the other end is connected on the soil bin partition plate 14. The soil bin partition 14 is provided with rollers by which the soil bin partition 14 can move within the semi-circular shield casing under the control of the drive rod 16. The axial force meter 15 is used for testing the pressure on the soil bin partition 14, and the linear displacement sensor 17 is used for testing the moving distance of the soil bin partition 14. The servo motor A19 provides power for the movement of the soil bin partition 14, the speed of the advance and retreat of the soil bin partition 14 is controlled by the speed changer 18, and the speed is controlled to be 0.02 mm/s-0.25 mm/s during operation.
The soil discharging and water discharging control device comprises a conveyor 22, a servo motor B23, a water discharging pipe 24, a valve 25, a flow meter 26 and a waste water tank 27, wherein the conveyor 22 is arranged at a residue soil outlet at the lower part of the partition plate, the conveyor 22 is connected to a servo motor B23 through an opening at the left side plate of the model box, and the servo motor B23 is fixed on an external support; the conveyor 22 is a 60 mm-diameter tubular screw conveyor, sealing cement 28 is filled in the tube in advance to prevent surging, and the screw speed is controlled by a servo motor B23 to realize quantitative soil discharge and water discharge control; the opening of the conveyer 22 close to the lower part of the muck outlet is connected with a drain pipe 24, the opening is sealed by a filter membrane to prevent a soil sample from entering the drain pipe 24, the drain pipe 24 is provided with a valve 25 and a flowmeter 26, and the drain pipe 24 is connected to a waste water tank 27.
Referring to fig. 6, a schematic structural diagram of a water level control device and a seepage tracing device in the simulation test system provided in this embodiment is shown.
The water level control system comprises a pressure pump 29, a water replenishing tank 30, a water supply pipe 31 and a valve 25. The water supply pipe 31 penetrates through openings in different heights of the right panel of the model box and extends into the model box for 3-5 cm, gaps at the openings are plugged with sealing materials to prevent water leakage, and an outlet of the water supply pipe 31 is sealed with a filter membrane to prevent soil samples from entering the pipe. The water supply tank 30 and the pressure pump 29 are connected through a water supply pipe 31, and a valve 25 is arranged on the water supply pipe 31 and used for supplying water to different heights to realize underground water level simulation.
The seepage tracing device comprises a pigment supply tank 32 and a pigment pipe 33, wherein the pigment pipe 33 is arranged close to the front panel of the model box and is erected in a shallow soil layer along the axial direction, the pigment supply tank 32 is adopted to supply various pigments for the pigment pipe 33, the pigment supply tank 32 is erected above the model box, the pigment pipe 33 is provided with a valve to control the supplement of the pigments, and the seepage distribution of the pigments at the position can be traced by the diffusion of the pigments under the seepage effect.
When the simulation test system is implemented, the specific steps are as follows:
(1) the model box 1 is installed, and the panels are bonded by adopting silicone structural adhesive. And welding and fixing the shield support 13, and adhering the semi-annular shield shell 12 to the shield support 13 and the front panel 11 of the model box, wherein the left side of the semi-annular shield shell is aligned with the opening of the left panel of the model box 1.
(2) And installing a shield tunneling system 3. The soil bin partition 14 is arranged in the shield model 2, the soil and water pressure sensor 10 is arranged in front of the soil bin partition 14, the transmission rod 16, the axial force meter 15, the speed changer 18 and the servo motor A19 are connected, the drainage pipe 24 is connected to the conveyer 22, the rear end of the conveyer 22 is connected with the servo motor B23, the front end of the conveyer 22 is arranged at a residue soil outlet 21 at the lower part of the soil bin partition 14, and a section of sealing clay 28 is filled.
(3) And installing a water level control device 4, plugging a gap at the opening by using a sealing material, detecting whether the model box 1 leaks water, and sealing the water leaking position if water leaks.
(4) And calibrating the moving speed of the soil bin partition plate 14 when no soil sample exists and the reading of an axial force meter 15 generated by the friction between the panel and the semi-circular shield shell 12 at different speeds.
(5) The soil bin partition 14 is moved to a position 1/3 from the forward end of the semi-circular shield housing 12 and filled with the improved muck 34.
(6) Filling a soil sample 7 in the model box 1 by adopting a rain-falling method, installing a seepage tracer device when the soil sample 7 height meets the model height corresponding to the shallow buried tunnel, arranging a pigment pipe 33 along the front panel 11 of the model box, and burying an outlet in a shallow soil layer.
(7) A digital camera 8 and a supplementary light source 9 are mounted on the front of a front panel 11 of the model.
(8) Water is added into the model box 1 through the water level control system 4 to simulate the underground water level.
(9) After the water level is stabilized, the valve 25 on the drain pipe 24 is opened, the shield tunneling system 3 is started, the soil bin partition 14 is pushed forward, and the conveyor 22 starts to operate and discharge soil. Simultaneously opening the valve 25 on the pigment tube 33 of the percolation tracer 5.
(10) The seepage law of underground water is displayed by a seepage tracing device, the pressure distribution and fluctuation law of the soil bin is observed by the soil and water pressure sensor 10 in front of the soil bin partition plate 14, a displacement field and a speed field of a soil body of a symmetrical plane can be obtained by PIV analysis of a camera recording picture, and the stress release of an excavation surface can be analyzed by the reading change of the axial force meter 15. Therefore, the stable state of the heading face is analyzed, and the instability development process and stage characteristics of the major-diameter shield heading face under the seepage action are revealed.
By using the simulation test system for the major-diameter earth pressure shield tunneling interface provided by the embodiment, different test conditions can be set for carrying out the following comparison tests:
under the condition that the height of the underground water level and the soil discharging speed of the conveyor 22 are unchanged, different soil bin partition plate 14 propelling speeds are set, and the influence of the tunneling speed on the instability condition of a tunneling surface is researched; under the condition that the height of the underground water level and the propelling speed of the soil bin partition plate 14 are unchanged, different soil discharging speeds of the conveyor 22 are set, and the influence of the soil discharging speeds on the instability condition of the tunneling surface is researched.
Different underground water levels are set, the seepage effect is more obvious when the underground water level is higher, the influence of the seepage effect on the stability of the tunneling surface is analyzed, and the seepage-induced instability mechanism of the tunneling surface is disclosed.
Different improved muck 34 prepared in an indoor test is not filled or filled in the shield model 2, and the inhibition effect of the different improved muck on the seepage effect is contrastively analyzed.
Claims (7)
1. The utility model provides a major diameter earth pressure shield tunnel tunnelling interface analogue test system, includes the mold box, the shield constructs the model, monitoring system, its characterized in that: the device is also provided with a shield tunneling system, a water level control device and a seepage tracing device;
the model box is a rectangular cube, the peripheral panels are made of transparent high-strength organic materials, a semicircular opening for installing a shield model and an opening for installing a shield tunneling system are respectively formed in one side panel of the model box, and a plurality of openings with different heights for installing water supply pipes of a water level control system are formed in the other opposite side panel of the model box; filling a soil sample in the model box;
the shield tunneling system comprises a soil bin control device and a soil discharging and water discharging control device; the soil bin control device comprises a soil bin partition plate, a shaft force meter, a transmission rod, a recording device, a transmission, a driving device and an external support; the soil bin partition plate is a semicircular panel and is arranged between the inner concave surface of the semicircular shield model shell and the front panel of the model box, and a muck outlet is formed in the lower part of the soil bin partition plate; the soil bin partition plate, the axial force meter and the transmission rod are sequentially connected, the transmission rod penetrates through one side panel of the model box and is connected to a speed changer outside the model box, the speed changer is connected with a driving device, and the driving device is fixed on an external support; one end of the recording device is fixed on the external support, and the other end of the recording device is connected to the soil bin partition plate; the soil bin partition plate moves in the semicircular shield shell under the control of the transmission rod; the axial force meter is used for testing the pressure of the movable panel, and the recording device is used for testing the moving distance of the movable panel; the driving device provides power for the movement of the movable panel, and the transmission is used for controlling the forward and backward speeds of the movable panel; the soil discharging and water discharging control device comprises a conveyor, a power device, a water discharging pipeline, a valve, a flowmeter and a waste water tank, wherein the conveyor is arranged at a residue soil outlet at the lower part of the soil bin partition plate, the conveyor penetrates through one side panel of the model box and is connected to the power device, and the power device is fixed on an external support; an opening below the conveyor is connected with a drain pipe, a water outlet valve and a flowmeter are arranged on the drain pipe, and the drain pipe is connected with a wastewater tank;
the water level control system comprises a pressure pump, a water replenishing tank, a water supply pipe and a valve; the water supply tank and the pressure pump are connected through a water supply pipe; a plurality of water supply pipes which are longitudinally arranged penetrate through an opening on one side panel of the model box and are inserted into the filling soil samples at different heights in the model box, and the outlets of the water supply pipes are sealed by filter membranes; a valve is arranged on the water supply pipe, the water level in the model box is controlled, the water supply pipe opening valves at different heights are selected, and the soil sample filled in the model box is filled with water, so that the soil sample at the upper part of the water level is in an unsaturated state, and the underground water level simulation is realized;
the seepage tracing device is arranged at the top of the model box and comprises a pigment pipe and a pigment supply tank, and the pigment pipes are inserted into a shallow soil layer filled with soil samples in the model box from the top of the model box along the axial direction and are arranged at a position close to a front panel in the model box; the pigment pipe is provided with a valve for controlling the supplement of the pigment;
the monitoring system comprises a digital photographic camera and soil and water pressure sensors; the digital photographic camera is arranged outside the front panel of the model box and used for recording the change condition of the soil sample in front of the tunneling surface in the test process; the soil and water pressure sensors are arranged on the soil bin partition plate and used for observing the pressure distribution and fluctuation rule of the driving surface.
2. The large-diameter earth pressure shield tunneling interface simulation test system according to claim 1, characterized in that: the improved muck is filled in the front inner space of the soil bin partition plate of the shield model, and the improvement of the dug soil body in the soil bin of the large-scale soil pressure shield machine is simulated.
3. The large-diameter earth pressure shield tunneling interface simulation test system according to claim 1, characterized in that: the driving device and the power device adopt servo motors.
4. The large-diameter earth pressure shield tunneling interface simulation test system according to claim 1, characterized in that: the recording device adopts a linear displacement sensor.
5. The large-diameter earth pressure shield tunneling interface simulation test system according to claim 1, characterized in that: the conveyer adopts a tubular screw conveyer, and the screw speed is controlled by a power device to realize quantitative soil discharging and water discharging control; and sealing clay is filled in the pipe of the tubular screw conveyor in advance.
6. The large-diameter earth pressure shield tunneling interface simulation test system according to claim 1, characterized in that: and a supplementary light source is arranged outside the front panel of the model box.
7. The large-diameter earth pressure shield tunneling interface simulation test system according to claim 1 or 5, characterized in that: the lower part of the conveyor, which is close to the residue soil outlet, is provided with an opening, the opening is sealed by a filter membrane, and the opening is connected with a drain pipe.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111255471A (en) * | 2020-01-15 | 2020-06-09 | 中南大学 | Multi-working-condition soil pressure balance shield muck workability test simulation test system |
| CN111693675A (en) * | 2020-06-23 | 2020-09-22 | 中山大学 | Tunnel non-excavation construction test device and method capable of simulating penetration of existing structures |
| CN113188994A (en) * | 2021-04-08 | 2021-07-30 | 同济大学 | Excavation surface stability test device and method considering vibration effect of shield cutter head |
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2019
- 2019-05-29 CN CN201920793855.2U patent/CN209945737U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111255471A (en) * | 2020-01-15 | 2020-06-09 | 中南大学 | Multi-working-condition soil pressure balance shield muck workability test simulation test system |
| CN111693675A (en) * | 2020-06-23 | 2020-09-22 | 中山大学 | Tunnel non-excavation construction test device and method capable of simulating penetration of existing structures |
| CN113188994A (en) * | 2021-04-08 | 2021-07-30 | 同济大学 | Excavation surface stability test device and method considering vibration effect of shield cutter head |
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